91142285 has 16 divisors (see below), whose sum is σ = 120970416. Its totient is φ = 65484288.

The previous prime is 91142281. The next prime is 91142291. The reversal of 91142285 is 58224119.

It can be written as a sum of positive squares in 8 ways, for example, as 12802084 + 78340201 = 3578^2 + 8851^2 .

It is a cyclic number.

It is not a de Polignac number, because 91142285 - 2² = 91142281 is a prime.

It is a super-3 number, since 3×91142285³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91142281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16544 + ... + 21353.

It is an arithmetic number, because the mean of its divisors is an integer number (7560651).

Almost surely, 2^91142285 is an apocalyptic number.

It is an amenable number.

91142285 is a deficient number, since it is larger than the sum of its proper divisors (29828131).

91142285 is a wasteful number, since it uses less digits than its factorization.

91142285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37952.

The product of its digits is 5760, while the sum is 32.

The square root of 91142285 is about 9546.8468616607. The cubic root of 91142285 is about 450.0284508761.

The spelling of 91142285 in words is "ninety-one million, one hundred forty-two thousand, two hundred eighty-five".